Owner`s manual | Carrier 50EZ Heat Pump User Manual

Comfortr 13 SEER Single---Packaged Heat Pump
System with Puron® (R---410A) Refrigerant
Single and Three Phase
2 --- 5 Nominal Tons (Sizes 024---060)
Owner’s Information Manual
Fig. 1 - Unit 50EZ
For your convenience, please record the model and serial numbers of your new equipment in the spaces
provided. This information, along with the installation data and dealer contact information, will be helpful
should your system require maintenance or service.
Model # _____________________________________
Date Installed ________________________________
Serial # ______________________________________
Company Name_______________________________
ACCESSORIES (List type and model #)
Phone Number _______________________________
Technician Name _____________________________
This manual must be left with the equipment owner.
Failure to follow this caution may result in personal injury.
Untrained personnel can perform basic maintenance functions such
as cleaning and replacing air filters. All other operations must be
performed by trained service personnel. When working on this
equipment, observe precautions in the literature, on tags, and on labels attached to or shipped with the unit and other safety precautions
that may apply.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing, safety glasses and
gloves when handling parts and servicing furnaces.
The operation of your heat pump system is controlled by the indoor
thermostat. You simply adjust the thermostat and it maintains the indoor temperature at the level you select. Most thermostats of heat
pump systems have 3 controls: a temperature control selector, a
FAN control, and a SYSTEM or MODE control. Refer to your thermostat owner’s manual for more information.
Follow all safety codes. Installation must be in compliance with local and national building codes. Wear safety glasses, protective
clothing, and work gloves. Have fire extinguisher available. Read
these instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit.
To better protect your investment and to eliminate unnecessary service calls, familiarize yourself with the following facts:
Recognize safety information. This is the safety--alert symbol !
When you see this symbol on the unit and in instructions or manuals,
be alert to the potential for personal injury.
1. During heating, increasing the desired temperature setting
more than 2°F (--17°C) may cause the supplemental heaters
to be turned on for a short period of time to satisfy the
demand. Needless use of the supplementary heat reduces
potential energy savings.
Understand these signal words: DANGER, WARNING, and CAUTION. These words are used with the safety--alert symbol. DANGER identifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies hazards which could
result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product
and property damage. NOTE is used to highlight suggestions which
will result in enhanced installation, reliability, or operation.
2. Ice or frost tends to form on the coil during winter heating
operation. Your unit is designed to automatically melt the
ice. When in this defrost cycle, it is normal for steam or
fog to rise from the outdoor unit, and for water to drain
from the outside of unit. Do not be alarmed!
To start the unit:
Note: Installer: This manual should be left with the equipment user.
1. Turn on the electrical power supply to unit.
2. Set MODE control to desired mode and select temperature.
To shut off unit:
Note: If the unit is being shut down because of a malfunction, call
your dealer as soon as possible.
1. Set system MODE control to OFF.
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Installation and servicing of this equipment can be
hazardous due to mechanical and electrical components.
Only trained and qualified personnel should install, repair,
or service this equipment.
2. Turn off the electrical power supply to unit.
Cooling Mode
With the SYSTEM or MODE control set to COOL, your unit will
run in cooling mode until the indoor temperature is lowered to the
level you have selected. On extremely hot days, your unit will run
for longer periods at a time and have shorter “off” periods than on
moderate days.
Heating Mode
With the SYSTEM or MODE control set to HEAT, your unit will
run in heating mode until the room temperature is raised to the level
you have selected. Of course, your unit will run for longer periods
to maintain a comfortable environment on cooler days and nights
than on moderate ones.
Failure to follow this warning could result in personal injury,
death or property damage.
Do not use this unit if any part has been under water.
Immediately call a qualified service technician to inspect the
unit and to replace any part of the control system which has
been under water.
Installation and servicing of this equipment can be hazardous due to
mechanical and electrical components. Only trained and qualified
personnel should install, repair, or service this equipment.
Supplemental Heat
Your unit is your primary heating source. Your system may also be
equipped with a supplemental heating source such as electric heat.
On cold days and nights, your system will automatically turn on the
supplemental heat, as needed, in order to maintain the level of comfort you have selected.
When your heat pump needs additional heat to keep you comfortable your thermostat will turn on the supplemental heat (if
Failure to follow this warning could result in personal injury
or death.
Defrost Mode
When your unit is providing heat to your home or office and the outdoor temperature drops below 45°F (7.2°C), moisture may begin to
freeze on the surface of the coil. If allowed to build up, this ice would
impede airflow across the coil and reduce the amount of heat ab-
Before performing recommended maintenance, be sure the
main power switch to unit is turned off and a lock--out tag is
sorbed from the outside air. So, to maintain energy--efficient operation, your unit has an automatic defrost mode.
instance of filter grilles, the filters can simply be removed from the
grille and replaced.
The other typical application is an accessory filter rack installed inside the unit itself. The following information is given to assist in
changing filters used in these internal filter racks.
The defrost mode starts at a preset time interval of 60 minutes, although, it may be reset to 30, 90 or 120 minutes. Defrost will start
at the preset time only if the ice is sufficient to interfere with normal
heating operation.
Table 1 indicates the correct indoor filter size for your unit. Refer
to Fig. 2 to access filters installed in the accessory filter rack. If using
an Accessory Filter Rack, refer to the Installation Instructions provided with it for correct filter sizes and quantities.
Table 1—Air Filters Located Inside Unit
(For Replacement Purposes)
After the ice is melted from the coil, or after a maximum of 10 minutes in defrost mode, the unit automatically switches back to normal
heating operation.
Do not be alarmed if steam or fog appears at the outdoor unit during
defrost mode. Water vapor from the melting ice may condense into
a mist in the cold outside air.
During certain weather conditions such as heavy snow and freezing
rain it is not uncommon for ice to build up on the unit grille. This is
normal for these weather conditions. Do not attempt to remove the
ice from the unit grille. This condition will not affect the proper
function of the unit and will clear within a few days.
Unit Size
Filter Size in. (mm)
20x20x1 (508x508x25)
20x24x1 (508x610x25)
50EZ036--- 042
24x30x1 (610x762x25)
50EZ048--- 060
24x36x1 (610x914x25)
Emergency Heating Mode
To replace or inspect filters in accessory filter rack:
In the event of primary unit heat failure, the emergency heat mode
allows your supplemental heating source to keep your home or office warm until your unit can be serviced. Contact your dealer in the
event of primary unit heat failure.
1. Remove the filter access panel (See Fig. 2) using a 5/16--in.
nut driver.
2. Remove the filter(s) by pulling it out of the unit. If the filter(s)
is dirty, clean or replace with a new one.
When installing the new filter(s), note the direction of the airflow arrows on the filter frame.
This section discusses maintenance that should be performed by
your dealer and care you, as the owner, may wish to handle for your
new unit.
If you have difficulty locating your air filter(s) or have questions
concerning proper filter maintenance, contact your dealer for instructions. When replacing filters, always use the same size and type
of filter that was supplied originally by the installer.
Routine Maintenance
All routine maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard procedure.
To assure proper functioning of the unit, flow of condenser air must
not be obstructed from reaching the unit. Clearance from the top of
the unit is 48 in. (1219 mm). Clearance of at least 36 in. (914 mm)
is required on sides except the power entry side (42 in. clearance)
(1067 mm) and the duct side (12 in. minimum clearance) (305 mm).
Maintenance and Care for the Equipment Owner
Before proceeding with those things you might want to maintain
yourself, please carefully consider the following:
Failure to follow this warning could result in personal injury,
death or property damage.
*For accessory filter rack.
Fig. 2 - Accessory Filter Rack Access Panel
(Optional Louvered Panels shown)
2. When removing access panels or performing maintenance
functions inside your unit, be aware of sharp sheet metal
parts and screws. Although special care is taken to reduce
sharp edges to a minimum, be extremely careful when
handling parts or reaching into the unit.
Failure to follow this warning could result in personal injury,
death or property damage.
Air Filters
The air filter(s) should be checked every 3 or 4 weeks and changed
or cleaned whenever it becomes dirty. Dirty filters produce excessive stress on the blower motor and can cause the motor to overheat
and shut down.
Never operate your unit without filters in place. An
accumulation of dust and lint on internal parts of your unit can
cause loss of efficiency.
Fans and Fan Motor
Periodically check the condition of fan wheels and housings and
fan--motor shaft bearings. Contact your dealer for the required annual maintenance.
This unit must have an air filter in place before it can be operated.
These filters should be located in at least one of two places. In many
applications, the installer will provide return air filter grilles
mounted on the wall or ceiling of the conditioned structure. In the
Indoor and Outdoor Coils
trained service technician. An inspection (preferably each year, but
at least every other year) should include the following:
Cleaning of the coils should only be done by qualified service personnel. Contact your dealer for the required annual maintenance.
Condensate Drain
1. Inspection and, if required, cleaning of the outdoor and
indoor coils.
The drain pan and condensate drain line should be checked and
cleaned at the same time the cooling coils are checked by your dealer.
2. Inspection and, if required, cleaning of the indoor coil drain
3. Inspection and cleaning of blower wheel housing and motor.
4. Inspection of all supply and return air ducts for leaks,
obstructions, and insulation integrity. Any problems found
should be resolved at this time.
All compressors are factory shipped with a normal charge of the correct type and quantity of refrigeration grade oil. A compressor
should rarely require additional oil.
5. Inspection of the unit base to ensure that no cracks, gaps, etc.,
exist which may cause a hazardous condition.
Condenser Fan
6. Inspection of the unit casing for signs of deterioration.
7. Inspection of all electrical wiring and components to assure
proper connection.
Failure to follow this warning could result in personal injury,
death or property damage.
8. Inspection for leaks in the refrigerant circuit. Pressure and
temperature check to determine appropriate refrigerant
Do not poke sticks, screwdrivers, or any other object into
revolving fan blades.
9. Operational check of the unit to determine working
conditions. Repair or adjustment should be made at this time.
The fan must be kept free of all obstructions to ensure proper cooling. Contact your dealer for any required service.
Your servicing dealer may offer an economical service contract that
covers seasonal inspections. Ask for further details.
Electrical Controls and Wiring
Complete service instructions can be found in the unit Installation,
Start--up and Service Instructions.
Electrical controls are difficult to check without proper instrumentation. If there are any discrepancies in the operating cycle, contact
your local dealer and request service.
Warranty Certificate
Your unit has a limited warranty. Be sure to read the warranty carefully to determine the coverage for your unit.
Refrigerant Circuit
Before you call for service...
The refrigerant circuit is difficult to check for leaks without the proper equipment. If inadequate cooling is suspected, contact your local
dealer for service.
...check for several easily solved problems.
If insufficient heating or cooling is suspected:
( ) Check for sufficient airflow. Check the air filter for dirt. Check
for blocked return or supply air grilles. Be sure they are open and unobstructed. If these checks do not reveal the cause, call your servicing dealer.
Failure to follow this warning could result in personal injury,
death or property damage.
If your unit is not operating at all, check the following list for
easy solutions:
System under pressure. Relieve pressure and recover all
refrigerant before system repair or final unit disposal. Use all
service ports and open all flow--control devices, including
solenoid valves.
( ) Check to be sure that your thermostat temperature selector is set
below the indoor temperature during the cooling season or above
the indoor temperature during heating season. Be sure the SYSTEM
switch or MODE control is in the COOL or HEAT and not OFF.
( ) If your unit still fails to operate, call your servicing dealer for
troubleshooting and repairs. Specify the model and serial numbers
of your unit. (Record them in this manual in the space provided.) If
the dealer knows exactly which unit you have, he may be able to offer suggestions over the phone, or save valuable time through
knowledgeable preparation for the service call.
Unit Panels
After performing any maintenance or service on the unit, be sure all
panels are fastened securely in place to prevent rain from entering
unit cabinet and to prevent disruption of the correct unit airflow pattern.
Regular Dealer Maintenance
In Case of Trouble
If you perform the steps above and unit performance is still unsatisfactory, shut off the unit and call your dealer.
In addition to the type of routine maintenance you might be willing
to perform, your unit should be inspected regularly by a properly
TO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or classified section of your local telephone directory under the
“Heating Equipment” or “Air Conditioning Contractors & Systems” heading for dealer listing by brand name.
Have available the Model No., Series Letter, & Serial No. of your equipment to ensure correct replacement part.
Copyright 2008 Carrier Corporation
Printed in the U.S.A.
Edition Date: 02/08
Manufacturer reserves the right to change, at any time, specifications and design without notice and without obligation.
Catalog No: OM50EZ---01
Replaces: OM50--- 55
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